Valve control device and valve system
AssigneesKeihin Corporation, Honda Motor Co., Ltd.
InventorsHiroshi Ito, Takuya Yahagi, Youichiro Shikine, Tomohide Ichikawa, Kensuke Yamamoto, Akihito Inoue
Life of this patent
Estimating the term…
Abstract
A valve control device includes a drive circuit for supplying a drive signal to an actuator adjusting an opening degree of a valve via a prescribed transmission line, generates a PWM signal on the basis of a target opening degree supplied from the outside and a sensor signal that indicates a real opening degree of the valve, and supplies the PWM signal to the drive circuit. The valve control device includes a disconnection detection unit which detects, on the basis of the PWM signal and a monitor signal of the drive signal, whether the transmission line is disconnected.
Claims7
A valve control device which has a drive circuit supplying a drive signal to an actuator adjusting a degree of opening of a valve via a predetermined transmission line, generates a PWM signal on the basis of a target degree of opening supplied from an outside and a sensor signal indicating a real degree of opening of the valve, and supplies the generated PWM signal to the drive circuit, wherein the drive circuit includes a self-diagnostic function of diagnosing its own soundness, the valve control device comprising:
- a disconnection detecting unit configured to detect, on the basis of the PWM signal and a monitor signal of the drive signal, whether the transmission line is disconnected, and the disconnection detecting unit detects the disconnection of the transmission line on the basis of a result of self-diagnosis of the drive circuit in addition to the PWM signal and the monitor signal of the drive signal.
A valve control device which has a drive circuit supplying a drive signal to an actuator adjusting a degree of opening of a valve via a predetermined transmission line, generates a PWM signal on the basis of a target degree of opening supplied from an outside and a sensor signal indicating a real degree of opening of the valve, and supplies the generated PWM signal to the drive circuit, the valve control device comprising:
- a disconnection detecting unit configured to detect, on the basis of the PWM signal and a monitor signal of the drive signal, whether the transmission line is disconnected,
- when the actuator is a motor, the disconnection detecting unit calculates an effective drive duty ratio excluding influence of a back electromotive force generated from a duty ratio of the PWM signal by the motor, and compares the effective drive duty ratio with the DUTY threshold.
Dependencies are inferred from the claim text.